Imperial College London

Sierra Clark

Faculty of MedicineSchool of Public Health

Research Postgraduate







171Norfolk PlaceSt Mary's Campus





I am a PhD student in the department of Epidemiology and Biostatistics at Imperial College London and a member of the Global Environmental Health Research Group and the Pathways to Equitable Healthy Cities project. I am currently a Canadian Institutes for Health Research (CHIR) and an Imperial College Presidents scholarship award holder.

Prior to starting my PhD, I did a MSc degree in Epidemiology (focus on environmental epidemiology) and a Bachelor of Arts degree in Geography at McGill University in Montreal, Canada. In 2016, I was a National Geographic Young Explorer. 

I am a field researcher who combines traditional and novel forms of data collection to model outdoor and indoor pollution environments and evaluate the effectiveness of interventions to improve environmental quality and public health. I use Bayesian and non-Bayesian statistical approaches and Geographic Information Systems (GIS). 

I am currently working on projects that model the spatiotemporal and socioeconomic patterns of air and noise pollution and their sources in Accra, Ghana. I previously worked in central China evaluating the effectiveness of a household energy intervention to improve indoor air quality, reduce personal exposures to air pollutants, and improve markers of cardiovascular health. I also worked with the Indigenous Health Adaptation to Climate Change project in Uganda on research related to the estimation and characterization of the burden, determinants, and lived experience of climate sensitive gastrointestinal illness among an Indigenous population. 

I have a keen interest in contributing to evidence-based policies for environmental health and received the 2017 Canadian Science Policy Youth Award for my policy proposal on addressing wood burning and air pollution in Canada. 

Selected publications (Full list here)

S Clark, et al,. (In press). Small area variations and factors associated with blood pressure and body-mass index in adult women in Accra, Ghana: Bayesian spatial analysis of a representative population survey and census data.  PLoS Medicine. 

S Clark, AS Alli, R Nathvani, A Hughes, M Ezzati, M Brauer, M Toledano, J Baumgartner, J Bennett, J Nimo, J Bedford Moses, S Terkpertey, S Agyei-Mensah, G Owusu, B Croft, R Arku. (2021). Space-time characterization of noise pollution and sound sources in Accra, Ghana. Scientific Reports.

AS Alli, S Clark, J Wang, J Nimo, J Bedford Moses, S Baah, A Hughes, M Ezzati, M Brauer, J Baumgartner, F Kelly, B Barratt, A Beddows, J Vallarino, S Agyei-Mensah, E Agyemang, G Owusu, R Arku. (2021). Spatial-temporal patterns of ambient fine particulate matter PM2.5 and black carbon (BC) pollution in Accra. Environmental Research Letters

S Clark, A.S Alli, M Brauer, M Ezzati, J Baumgartner, M Toledano, A Hughes, J Nimo, J Bedford Moses, S Terkpertey, J Vallarino, S Agyei-Mensah, E Agyemang, R Nathvani, E Muller, J Bennet, J Wang, A Beddows, F Kelly, B Barratt, S Beevers, R Arku. (2020). High-resolution spatiotemporal measurement of air and environmental noise pollution in sub-Saharan African cities: Pathways to Equitable Health Cities Study protocol for Accra, Ghana. BMJ Open

A Lai, S Clark, E Carter, M Shan, K Ni, X Yang, J Baumgartner, JJ Schauer. (2019). Impacts of stove/fuel use and outdoor air pollution on chemical composition of household particulate matter. Indoor Air.

S Clark, A Schmidt, E Carter, JJ Schauer, M Ezzati, X Yang, S Daskalopoulou, J Baumgartner. (2019). Longitudinal Evaluation of a household energy package on blood pressure, central hemodynamics, and arterial stiffness in China. Environmental Research

J Baumgartner, S Clark, E Carter, A Lai, Y Zhang, M Shan, J Schauer, X Yang (2019) Effectiveness of a household energy package in improving indoor air quality and reducing personal exposure in rural China. Environmental Science & Technology

C Brehmer, A Lai, S Clark, M Shan, K Ni, M Ezzati, X Yang, J Baumgartner, J Schauer, E Carter. (2019). The Oxidative Potential of Personal and Household PM2.5 in a Rural Setting in Southwestern China. Environmental Science and Technology. 53: 2788-2798. 

G Snider, E Carter, S Clark, J Tseng, X Yang, M Ezzati, J Schauer, C Wiedinmyer, J Baumgartner. (2018). Impacts of stove use patterns and outdoor air quality on household air pollution and cardiovascular mortality in southwestern China. Environment International. 117: 116-124. 

S Clark, E Carter, M Shan, K Ni, H Niu, JWT Tseng, S Pattanayak, M Jeuland, J Schauer, M Ezzati, C Wiedinmyer, X Yang, J Baumgartner. (2017). Adoption and use of a semi-gasifier cooking and water heating stove and fuel intervention in the Tibetan Plateau, China. Environmental Research Letters. Special Issue.

S Clark, L Berrang-Ford, S Lwasa, D Namanya, S Twesigomwe, IHACC Research Team, M Kulkarni. (2016) A Longitudinal Analysis of mosquito net ownership and use in an Indigenous Batwa population after a targeted distribution. PLoS ONE. 11(5): e0154808. doi:10.1371/journal. pone.0154808.

S Clark, L Berrang-Ford, S Lwasa, DB Namanya, VL Edge, IHACC research group, S Harper. (2015). The burden and determinants of self-reported acute gastrointestinal illness in an Indigenous Batwa Pygmy population in southwestern Uganda. Epidemiology and Infection. 143(11): 2287-98.



Wang J, Alli AS, Clark S, et al., 2021, Nitrogen oxides (NO and NO2) pollution in the Accra metropolis: Spatiotemporal patterns and the role of meteorology, Science of the Total Environment, Vol:803, ISSN:0048-9697

Alli AS, Clark S, Hughes AF, et al., 2021, Spatial-temporal patterns of ambient fine particulate matter (PM2.5) and black carbon (BC) pollution in Accra, Environmental Research Letters, Vol:16, ISSN:1748-9326, Pages:1-12

Clark S, Alli A, Nathvani R, et al., 2021, Space-time characterization of community noise and sound sources in Accra, Ghana, Scientific Reports, Vol:11, ISSN:2045-2322, Pages:1-14

Loo RL, Lu Q, Carter E, et al., 2021, A feasibility study of metabolic phenotyping of dried blood spot specimens in rural Chinese women exposed to household air pollution, Journal of Exposure Science and Environmental Epidemiology, Vol:31, ISSN:1559-0631, Pages:328-344

Clark S, Alli AS, Brauer M, et al., 2020, High-resolution spatiotemporal measurement of air and environmental noise pollution in sub-Saharan African cities: Pathways to Equitable Health Cities Study protocol for Accra, Ghana, Bmj Open, Vol:10, ISSN:2044-6055

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